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Korrigierender Lehrer：天蓬老師Korrekturzeit：2019-01-30 09:32:35
Zusammenfassung des Lehrers：多級(jí)下拉菜單 , 是經(jīng)常遇到的需求, 不過, 現(xiàn)在的一個(gè)趨勢(shì)是減少菜單的層級(jí), 基本上都是單級(jí)居多, 畢竟如果手機(jī)訪問, 多級(jí)很難操作的,對(duì)吧, 但對(duì)于多級(jí)的實(shí)現(xiàn)原理, 還是要掌握的